cs_user_radiative_transfer_bcs.cpp File Reference

#include "cs_defs.h"
#include <assert.h>
#include <string.h>
#include <math.h>
#include "cs_headers.h"

Include dependency graph for cs_user_radiative_transfer_bcs.cpp:

Functions
void	cs_user_radiative_transfer_bcs (cs_domain_t *domain, const int bc_type[], int isothp[], cs_real_t *tmin, cs_real_t *tmax, cs_real_t *tx, const cs_real_t dt[], const cs_real_t thwall[], const cs_real_t qincid[], cs_real_t hfcnvp[], cs_real_t flcnvp[], cs_real_t xlamp[], cs_real_t epap[], cs_real_t epsp[], cs_real_t textp[])
	User definition of radiative transfer boundary conditions. More...

Function Documentation

cs_user_radiative_transfer_bcs()

void cs_user_radiative_transfer_bcs	(	cs_domain_t *	domain,
		const int	bc_type[],
		int	isothp[],
		cs_real_t *	tmin,
		cs_real_t *	tmax,
		cs_real_t *	tx,
		const cs_real_t	dt[],
		const cs_real_t	thwall[],
		const cs_real_t	qincid[],
		cs_real_t	hfcnvp[],
		cs_real_t	flcnvp[],
		cs_real_t	xlamp[],
		cs_real_t	epap[],
		cs_real_t	epsp[],
		cs_real_t	textp[]
	)

User definition of radiative transfer boundary conditions.

See Examples of data settings for radiative transfers for examples.

Warning

the temperature unit here is the Kelvin

For each boundary face face_id, a specific output (logging and postprocessing) class id may be assigned. This allows realizing balance sheets by treating them separately for each zone. By default, the output class id is set to the general (input) zone id associated to a face.

To access output class ids (both for reading and modifying), use the cs_boundary_zone_face_class_id function. The zone id values are arbitrarily chosen by the user, but must be positive integers; very high numbers may also lead to higher memory consumption.

Wall characteristics

The following face characteristics must be set:

• isothp(face_id) boundary face type
  • CS_BOUNDARY_RAD_WALL_GRAY: Gray wall with temperature based on fluid BCs
  • CS_BOUNDARY_RAD_WALL_GRAY_EXTERIOR_T: Gray wall with fixed outside temperature
  • CS_BOUNDARY_RAD_WALL_REFL_EXTERIOR_T: Reflecting wall with fixed outside temperature
  • CS_BOUNDARY_RAD_WALL_GRAY_COND_FLUX: Gray wall with fixed conduction flux
  • CS_BOUNDARY_RAD_WALL_REFL_COND_FLUX: Reflecting wall with fixed conduction flux

Depending on the value of isothp, other values may also need to be set:

• rcodcl = conduction flux
• epsp = emissivity
• xlamp = conductivity (W/m/K)
• epap = thickness (m)
• textp = outside temperature (K)

Parameters

[in,out]	domain	pointer to a cs_domain_t structure
[in]	bc_type	boundary face types
[in]	isothp	boundary face type for radiative transfer
[out]	tmin	min allowed value of the wall temperature
[out]	tmax	max allowed value of the wall temperature
[in]	tx	relaxation coefficient (0 < tx < 1)
[in]	dt	time step (per cell)
[in]	thwall	inside current wall temperature (K)
[in]	qincid	radiative incident flux (W/m2)
[in]	hfcnvp	convective exchange coefficient (W/m2/K)
[in]	flcnvp	convective flux (W/m2)
[out]	xlamp	conductivity (W/m/K)
[out]	epap	thickness (m)
[out]	epsp	emissivity (>0)
[out]	textp	outside temperature (K)